Flora of North America species comparison

segments firmly attached, cylindric, 10–30(–50) × 2–2.5(–3) cm;

tubercles prominent, narrow to broad, 1.5–4.5 cm;

areoles elliptic to subcircular, 4–5.5 × 4–5 mm;

wool white or yellowish to tan, aging gray-black.

segments green to purplish green, 6–30 × 1.5–2.5 cm;

tubercles prominent, oval to elongate-elliptic, 0.7–3 cm, sometimes appearing as ribs;

areoles elliptic, 4.5–5 × 3–3.5 mm;

wool tan, aging dark gray.

6–20(–30+) per areole, often accompanied by 0–5 short bristlelike spines at areole margins, usually in distal areoles;

major abaxial spines deflexed to divergent, subterete to flattened;

major adaxial spines ascending-divergent, terete, yellow or tan to deep red-brown, aging gray, the central spine longest, 12–30(–38) mm;

sheaths white to grayish with yellow to golden tips, baggy to tight fitting.

(0–)7–13(–20) per areole, at most areoles, rarely obscuring stems, yellow to orange-brown with yellow tips, aging dark gray, subequal or 1–6(–7) much longer to 3 cm;

sheaths whitish or gold to brown, moderately loose.

in inconspicuous to small adaxial tuft, yellow to brown, 0.5–2 mm.

yellow-tan to red-brown in dense adaxial crescent and scattered, stouter ones at basal margins.

inner tepals bright yellow to bronze to brick red, spatulate, 20–30 mm, apiculate-emarginate;

filaments red;

anthers yellow;

style and stigma lobes white to light green.

inner tepals yellow to greenish yellow;

outer ones tipped red, 15–30 mm;

filaments green or yellow;

anthers yellow;

style light green or cream-white (rarely pinkish) apically;

stigma lobes cream-white to yellow.

tan at maturity, obconic to ellipsoid, 15–35 × 15–20 mm, dry, tuberculate, densely to sparsely spiny (rarely spineless), with apical flange above shallow umbilicus;

basal tubercles longest;

areoles 12–30.

green to yellowish, drying gray-tan, short top-shaped to subspheric, 15–32 × 13–26 mm, leathery-dry, tuberculate, few spined or spineless;

proximal tubercles longest;

umbilicus deep;

rim slightly flanged;

areoles 13–30.

pale yellow to tan, angular or squarish in outline, warped, 3.5–5 × 3–4.5 mm, sides smooth, each with 2–4 large depressions;

girdle smooth.

tan, squarish to angular in outline, warped, (4–)5–7 × 4–5 mm, sides with 2–4 deep depressions;

girdle smooth.